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# WEEKNUM

## Name

WEEKNUM --

## Synopsis

    WEEKNUM (date, method)

## Description

WEEKNUM returns the week number of @date according to the given @method.

@method defaults to 1.

For method=1, week starts on Sunday, and days before first Sunday are in week 0.

For method=2, week starts on Monday, and days before first Monday are in week 0.

For method=150, the ISO 8601 week number is returned.

Returns #NUM! if date or method is invalid.

This function is Excel compatible, except that Excel does not support ISO 8601 week numbers.

## Examples

If A1 contains 12/21/00 then WEEKNUM(A1,2)=51

## See also

ISOWEEKNUM.

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